According to the walkthrough, bell #3 is in Chichen Itza. Here is an excerpt from the Chichen Itza portion of the walkthrough:

Quote:

Chamber with Side Halls: The chamber has 2 side aisles. Forward and look at carving on side walls. Forward once again and turn left. At the middle of the left side aisle is an access underground.

Left Passage - Go forward into passage that goes down. At the very end of the passage, pick up Devil's triangle skull #1. Turn around and go forward 3xs.

Blowing Horns Secret Room - Look up and climb up to a secret room. The room has murals depicting men blowing horns. Go to left wall and look down at the plate. Pick up #3 bell. Go down the shaft and continue back up to the chamber.

Hopefully that will give you enough to go on to find it in the walkthrough.

I am not all that great on providing help for this game - it's pretty much a case of the blind leading the blind, as the expression goes.

I used to play more adventure games but my time became more scarce over the years and so I switched to Big Fish HOPAs for the most part, where I could have frequent interruptions and it didn't matter as much as it would with a game that required more concentration. Thus, I have big gaps in terms of what adventure games I have and haven't played.

If you are still in the area where the bell puzzle is I THINK you have to find how to get out of there and then follow these instructions (from UHS Hints):

How do I find the underground passageways?

The underground passageways are not accessible from any of the principal structures around El Castillo.

You might want to take a stroll a little ways away from the crowd, and relax a bit.

Explore around the edge of the open area.

You should find a long open pathway leading directly away from El Castillo.

Go to the end of the pathway, and you will come to a low stone wall.

Explore this area.

It looks like you've found a Mayan cenote -- a water-filled limestone sinkhole.

Cenotes provided a stable water supply for the Mayan people -- and were often created by the erosion of ground over a cavern. Looks like there might be some serious underground caverns here, if we could only get down there to check.

But you won't be able to just climb down there.

Perhaps you could rappel down -- if you had a rope... and some way to anchor it.

Use the grappling hook on the pool side of the low stone wall. (You'll need to have your back to the pool at the time.)Where can I find the grappling hook?

When it attaches, you will have a rope that you can climb down.

Look at the stone wall when you get to the bottom of the rope.

There is a small passage that you can climb into. This is the beginning of the underground passageways.